int to binary java
String binary = Integer.toBinaryString(num);
                                
                            java int to binary
public static String makeBinaryString(int n) {
	StringBuilder sb = new StringBuilder();
	while (n > 0) {
    sb.append(n % 2);
		n /= 2;
	}
  	sb.reverse();  	
  	return sb.toString();
}
                                
                            convert decimal to binary in java
public class DecimalToBinaryExample2{    
public static void toBinary(int decimal){    
     int binary[] = new int[40];    
     int index = 0;    
     while(decimal > 0){    
       binary[index++] = decimal%2;    
       decimal = decimal/2;    
     }    
     for(int i = index-1;i >= 0;i--){    
       System.out.print(binary[i]);    
     }    
System.out.println();//new line  
}    
public static void main(String args[]){      
System.out.println("Decimal of 10 is: ");  
toBinary(10);    
System.out.println("Decimal of 21 is: ");  
toBinary(21);    
System.out.println("Decimal of 31 is: ");    
toBinary(31);  
}}
                                
                            integer to binary java
Integer.toString(100,8) // prints 144 --octal representation
Integer.toString(100,2) // prints 1100100 --binary representation
Integer.toString(100,16) //prints 64 --Hex representation
                                
                            how to get binary value in java
import java.util.*;
class Bin {
    //fields
    private Double number;
    //constructors
    public Bin(){
        number = 0.0;
    }
    public Bin(Double num){
        number = num;
    }
    //methods
    public ArrayList<String> reverseArrayList(ArrayList<String> alist) {
        
        ArrayList<String> array = new ArrayList<String>();
        int x = 0;
        int i = alist.size() - 1;
        while(x < alist.size()){
            array.add(alist.get(i));
            i -= 1;
            x += 1;
        }
        return array;
    }
	//getter methods
    public ArrayList<String> getBinVal(){
        ArrayList<String> binaryVal = new ArrayList<String>();
        ArrayList<String> array = new ArrayList<String>();
        Double num = number;
        Double sol1, check; 
        while( num > 0 ) {
            sol1 = num/2;
            check = sol1 - Math.floor(sol1);
            if(check > 0) {
                binaryVal.add("1");
                num = sol1 - 0.5;
            }
            else {
                binaryVal.add("0");
                num = sol1;
            }
        }
        while(binaryVal.size() < 4) {
            binaryVal.add("0");
        }
        array = reverseArrayList(binaryVal);
        return array;
    }
}
class MainClass {
    
    public static void main(String[] args) {
		
      	//add the number in as a command line argument
        Double num = Double.valueOf(args[0]);
		
      	//create an instance of Bin
        Bin value = new Bin(num);
		
      	//print the binary value
        System.out.println(value.getBinVal());
    }
}
                                
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